re PR c++/86546 (ICE on invalid: tree_class_check_failed())

/cp
2018-08-28  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/86546
	* decl.c (finish_case_label): If the type is erroneous early
	return error_mark_node.

/testsuite
2018-08-28  Paolo Carlini  <paolo.carlini@oracle.com>

	PR c++/86546
	* g++.dg/other/switch4.C: New.

From-SVN: r263921

gcc/cp/ChangeLog

+2018-08-28  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/86546
+	* decl.c (finish_case_label): If the type is erroneous early
+	return error_mark_node.
+
 2018-08-27  David Malcolm  <dmalcolm@redhat.com>
 
 	PR c++/63392

gcc/cp/decl.c

@@ -3662,6 +3662,8 @@ finish_case_label (location_t loc, tree low_value, tree high_value)
     return error_mark_node;
 
   type = SWITCH_STMT_TYPE (switch_stack->switch_stmt);
+  if (type == error_mark_node)
+    return error_mark_node;
 
   low_value = case_conversion (type, low_value);
   high_value = case_conversion (type, high_value);

gcc/testsuite/ChangeLog

+2018-08-28  Paolo Carlini  <paolo.carlini@oracle.com>
+
+	PR c++/86546
+	* g++.dg/other/switch4.C: New.
+
 2018-08-28  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/87124

gcc/testsuite/g++.dg/other/switch4.C

+// PR c++/86546
+
+class a b;  // { dg-error "aggregate" }
+void c() {
+  switch ()  // { dg-error "expected" }
+  case b  // { dg-error "expected" }